Pregnant women who are overweight or obese can encounter a host of health complications. The added weight also appears to affect how their children grow and develop, at least initially. In a new study published in the Journal of Pediatrics, a team led by a University of Iowa researcher compared the weight and height of babies born to overweight and obese mothers with those born to normal-weight mothers. Contrary to expectations, babies of overweight/obese mothers gained less weight and grew less in length than babies of normal-weight women from just after birth to three months. The overweight/obese mother babies also gained less fat mass than those born to normal-weight mothers. Fat mass in infants is widely considered to be crucial to brain growth and development. (That may explain why humans have the fattest newborns of any mammal.)